颜色差异的VEP时空分布研究

Spatio-temporal Distribution of Chromatic VEPs

不同的颜色诱发的VEP在人脑皮层上具有不同的分布特性。我们通过让被试对象注视含有不同颜色的梯度条图像的实验,着重研究了颜色诱发出的VEP的时空分布特征,比较了不同颜色VEP在特定脑皮层不同区域上分布有何特异性。研究发现当刺激为不同颜色时,三种颜色VEP的P1波和N1波的潜伏期和波幅特征具有显著差异(P<0.001)。大脑皮层对红色的感知速度与强度要高于黑色。而在大脑皮层不同区域位置,颜色VEPP1波和N1波的潜伏期和波幅特征具有显著差异(P<0.001)。枕颞区的反应强度强于其他区域,额区、顶区的VEP潜伏期短于枕颞区。

The VEPs evoked by different colors are differently distributed on human cerebral cortex. This study sought to shed light on the spatio-temporal distribution of chromatic VEPs and compare the distribution characteristics of chromatic VEPs evoked by different colors in different cerebral cortex regions. The subjects were asked to stare at the red, green, black gradient bars against a white background. The results show that the latency periods and the amplitudes of P1 and N1 peaks from different chromatic VEPs exhibit significant differences （P〈0. 001）. The speed and intensity of cognitive task of red are higher than those of green. The latency periods and the amplitudes of P1 and N1 peaks from different cerebral cortex regions also display remarkable differences （P〈0. 001）. The intensity of reaction in the temporal and occipital regions is stronger than that in other regions, and the latency periods in frontal area and central area are shorter than those in temporal and occipital regions.